Dauphin County /ˈdɔːfɪn/ is a county in the U.S. state of Pennsylvania.

The county seat and the largest city is Harrisburg,[3] Pennsylvania's state capital and tenth largest city.

The county was created ("erected") on March 4, 1785, from part of Lancaster County and was named after Louis-Joseph, Dauphin of France, the first son of king Louis XVI.

Located within the county is Three Mile Island Nuclear Generating Station, site of the 1979 nuclear core meltdown.

https://en.m.wikipedia.org/wiki/Dauphin_County,_Pennsylvania

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Harrisburg is home to the Pennsylvania State Capitol. Completed in 1906, the central dome rises to a height of 272 feet (83 m) and was modeled on that of St. Peter's Basilica in Vatican City, Rome.

https://en.wikipedia.org/wiki/Harrisburg,_Pennsylvania#Architecture